独立通风笼盒系统内传热传质分析

Analysis of Heat and Mass Transfer inside the Individual Ventilated Cage

目的为了有效控制独立通风笼盒系统(individual ventilated cages,IVC)内环境的舒适性,保证笼盒内实验动物的生存和健康,对笼盒内的温度、湿度及氨浓度进行测试,并对笼盒内传热传质机理进行分析,同时为实验动物生存环境(密闭建筑空间、设备)控制提供参考。方法小鼠75只,按数量递增顺序随机分为5组,饲养于同一架IVC设备内,分别对笼盒内的温度、湿度和氨浓度进行连续7 d的测试。结果随着饲养天数的增加,笼盒内和房间内的温度差变化基本一致,相对湿度差和氨浓度差逐渐增大;同时笼盒内、外的氨浓度差同动物数量和时间均相关,有显著差异(P<0.05),即动物只数越多,时间越长,氨浓度差越大。结论IVC笼盒内温度受设施内温度的影响较大;相对湿度主要与送风空气相对湿度和换气次数有关;氨浓度与换气次数和动物只数有关。

Objective To effectively control the environmental comfort of in the individual ventilated cages(IVC),to ensure the survival and health of the experimental animals in the cage,to test the temperature,humidity and ammonia concentration in the cage,and to analyze the heat and mass transfer mechanism in the cage,and provide reference for the control of living environment(closed building space and equipment)of experimental animals.Method Seventy-five mice were randomly divided into 5 groups,and each group was randomly divided into 5 groups according to the number of 1 to 5 increments.They were kept in the same IVC equipment,and the temperature,humidity and ammonia concentration in the cage were tested for 7 consecutive days.Result With the increase of the number of days,the temperature difference between the cage and the room was basically the same,the relative humidity difference and the ammonia concentration difference gradually increased.At the same time,the ammonia concentration difference inside and outside the cage was significantly different from the number and duration of the animals(P<0.05),if the case have more animals and feed longer time,the greater the difference in ammonia concentration.Conclusion The temperature inside the IVC cage is greatly affected by the temperature in the facility.The relative humidity is mainly related to the relative humidity of the supply air and the number of air changes.The ammonia concentration is related to the number of air changes and the number of animals.